Electro-magnetic car-brake



(fio Model.)

\ f H. Sl PARK..

ELECTRO MAGNETIGGAR BRAKE. I 10.274,023. `fantented Mar. 13,1883.`

Bagel.

u. PETERS, Pima-ummm wuwnmnfn. c.

r UNITED STATES: ,PATENT OFFICE.

YHARVEY s. PARK, or HENDERSON, KENTUCKY.

ELECTRO-MAGNETIC CAR-BRAKE. 'y

. SPECIFICATION refining part of Letters sPatent No. 274,023, datedMarch 13, 1883,`

Application filed July 7, Issa. (No model.)

To all whom it 'may concer);

Be it known that I, HARVEY S. PARK, a citizen of the United States, -residing at Hellderson, in the county of Henderson and State of Kentucky, have invented certain new and useful Improvements in Electro-Magnetic Gar- Brakes, of which the following is "a specification. l

My invention relates especially to those brakes in which the brake-shoes are operated by the motion of the train itself, the connecting` and disconnecting of the brakes being through the medium lof electrical apparatus under the control of the engineer or conductor. My improvements particularly consist, first,

"in mounting the electromagnet employed to operate the clutch for engaging the brake mechanism directly upon the clutch-shaftin such manner that i-t shall form one member of the clutch and its armature the other member; second, in the interposition in the main circuit .to the velectro-magnets of a shunt throu gh a rheostat or resistancacoil for the more ready regulation of the current sent through the main circuit.

In order that my invention may -be fully understood, I will proceed to `describe it with a car within a frame, 1. Aband pulley ort drum, 2, keyed or otherwise attached on shaft 3, which has bearing, as shown, in frame 1, re-

ceives continuous motion, so long as the car moves, by means of band 4, driven` by a pulley or drum on the axle of the car. On the inner end of the shaft 3 is placed a disk, 5, having loose square bearings, so as to be capable of horizontal movement on the said shaft, but

forced to 'revolve therewith, and so ground and adjusted on the shaft that its inner face shall revolve in a perfectly-vertical plane. In-v stead of a squareb'earing between the disk and shaft, I may employ a roundlbearing and secure the rotation of the disk by customary key and seat. Y

Mounted upon the other side vof the frame, in line with shaft 3, is a second shaft,6,`which carries on its inner end an electro-magnet, or number of magnets, 7, allwound by a continuous wire in the Asame direction, so as to present the same pole of each magnet opposite the face of the disk 5. A-disk or plate, S, unites the inner ends ofthe magnets and presents a plane surface exactly parallel to that of the disk 5.

`A current of electricity istransmitted from the generator by conductor 9 to binding-post 10 and plate l1, which is electrically conne-ctl ed by spring orV brush 12 with a circular band, 13, wrapped around the electro-magnet, and connected to the induction-wire of the same. The said wire, after passing around all the magnets, is connected to the other band, 14,

whence the current flows through brush 15,

plate 16, binding-post 17, and conductor 18 to f disks 5 and 8. becoming more or less iirmly bound together, (according to the/strength of lthe current,) the disk 8, magnets 7, and shaft 6 will revolve with the disk 5, actuating, through pinion 19 'and gear-wheel 20, the windlass 21, which winds up the chain 22 and applies the brakes.

1t will be apparent that the brakes will be applied with al greater or less degree of force, according to the strength of the current directed to the electro-magnet, and to regulate this current I employ a rheostat or resistance-coil, arranged substantially as shown in Fig. 3. In this figure, 23 represents a dynamo-generator of any suitable construction, having wires 9 and 18 to and from the braking mechanism, and wires 24 25 to and from a rheostat or resstalicecoil, 26, which is placed within con IOO venient reach of the engineer. The relative resistances of the line and shunt circuits are such that when the rheostat is closed the entire current passes through the conductors 24 25, to and through the rheostat, and back to the generator, thus completing the circuit,

while as the rheostat is opened the current so that as the rheostat is opened more and more one after another of the brakes will be brought into play, and when the rheostat-is pulled entirely open the Whole circuit going to line will set the brakes ot the entire train.

The advantages of this method of construction is obvious, as the too sudden stopping of a train ot' any length might be productive of injury to life and property, whereas by placing the current under the absolute control of the engineer, who Works it easily at Will, all danger from any shock may be avoided.

In an electro-magnetic car-brake, the shaft 3, carrying pulley 2 and disk 5, the latter being arranged to slide 'longitudinally on the shaft 3 and to turn with it, the shaft 6, carrying pinion 19, electro-magnets 7, and disk 8, and the Winding-shaft 21, with gear-Whee120 and chain 22, connecting with the brake-operating mechanism, said parts being attached to a frame, by which they are secured to the car-body or truck-frame, in combination With the dynamo-- generator 23, conductors 9 1-8, posts 1() 17, plates 11 16, springs or brushes l2 l5, connecting-bands 13 14, said parts being also carried by the said attaching-frame, and a rheostat, 26, for regulating the strength of applied currents, as set forth.

HARVEY S. PARK.

Witnesses:

W. A. (JULP, JOHN W. GEIBEL. 

